The following is what I posted to openstack mailing list. I'm not sure if anyone on this list is interested in OpenStack, another cloud infrastructure software (http://www.openstack.org/) though. For people who haven't heard about OpenStack or Swift: Swift is a highly available, distributed, eventually consistent object/blob store. https://launchpad.net/swift It's RackSpace's Cloud Files software. = Hello, I've just started playing with swift, implemented block storage service (iSCSI) on the top of swift: git://git.kernel.org/pub/scm/linux/kernel/git/tomo/tgt.git swift The iSCSI daemon provides iSCSI volume to clients, storing the data in swift. In short, it can be used like EBS. tgt is an iSCSI target implementation that I've maintained and lots of Linux distributions are shipped with it (RHEL, SUSE, debian, Ubuntu, etc). I need to study more to know if swift can fill the requirements for block storage service (I just implemented this to play with swift) but I think that it would be great if multiple storage interfaces (S3, EBS, etc) can be implemented, using swift (and other OpenStack components probably). The iSCSI daemon is supposed to run on swift's proxy host. I think that you can set up HA iSCSI service easily on two proxy hosts with the existing software. One feature in OpenStack I want for this is something like ZooKeeper. It enables to build a more scalable iSCSI service with multiple proxy hosts. Currently, one container corresponds to one volume. volume are split 8MB objects (e.g., 8GB volume consists of one container including 1024 objects). The more clever scheme can be used to implement Snapshot feature (like Sheepdog, Ceph's rados, etc do). There are tons of TODOs (huge room for performance improvement, proper error handling, etc) but looks like it works (I successfully created an ext3 file system on swift's iSCSI volume and store some files on it). Anyone is interested? I'd like to know what OpenStack team plans for block storage service. Thanks, -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
